A method for driving a display screen

Abstract

The application provides a driving method of a novel display screen, comprising the following steps: S1, setting m groups of VGH driving voltages of V1 and V2, and sequentially naming the m groups of driving voltages as VGH1-VGHn, n<=m; and the voltages of VGH1-VGHn gradually decrease; S2, after a driving chip of the panel is started, the VGH driving voltages of V1 and V2 are set as VGH1; S3, the panel outputs a current detection picture; S4, a current detection module reads an actual working current value of the detection picture, and compares the actual working current value with a set working current value range; if the actual working current value is in the set working current value range, the driving chip uses the VGHn in the group, the driving chip normally outputs a signal, a backlight is lighted, and the panel normally works; otherwise, the driving chip starts a VGH voltage switching mechanism, and switches the VGH driving voltages of V1 and V2 to a lower VGHn. Through the above method, the stage transmission failure problem caused by the aging of devices in the gate stage driving circuit can be improved, and the service life of the product is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display panel, and particularly to a driving method of a new display screen. BACKGROUND

[0002] The display of a liquid crystal display panel is completed by controlling the in-plane pixel TFT, specifically, the opening and closing of the TFT is controlled by the transverse gate signal (Gate) and the longitudinal source signal (Source) writes the desired display data. The generation of the gate signal is generated by the gate drive circuit on both sides of the panel, which is referred to as GIP (Gate In Panel) drive circuit, also known as gate stage drive circuit.

[0003] The common gate stage drive circuit is as shown in the figure Figure 1 The gate stage drive circuit is mainly composed of a pre-circuit, a voltage stabilizing circuit and an output circuit. When the Q point is pulled high, the signal is output, and the gate stage is opened. When the P point is pulled high, the gate stage is closed. The gate stage drive circuit mainly controls the level of the P point and the Q point to control the stage transmission mechanism.

[0004] The P point is the core of the voltage stabilizing circuit. Generally, when V1 or V2 signal outputs VGH, P1 point or P2 point is pulled high to keep Gn in a closed state. Generally, the VGH voltage is constant. However, after the panel works for a long time, some devices of the voltage stabilizing circuit may be aged, causing the P point to pull down the Q point too fast, and the gate stage drive circuit is closed in advance, affecting the stage transmission of the gate stage circuit. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a driving method of a new display screen, which can improve the stage transmission failure problem caused by the aging of some devices in the gate stage drive circuit, and prolong the service life of the product.

[0006] The present application provides a driving method of a new display screen, comprising the following steps:

[0007] S1, setting m groups of VGH driving voltages of V1 and V2, and sequentially naming the m groups of VGH driving voltages as VGH1-VGHn, n≤m; and the voltages of VGH1-VGHn gradually decrease;

[0008] S2, after the driving chip of the panel is started, the VGH driving voltages of V1 and V2 are set as VGH1;

[0009] S3, the panel outputs a current detection picture;

[0010] S4, the current detection module reads the actual working current value of the detection picture, and compares it with the set working current value range;

[0011] If the actual working current value is in the set working current value range, the driving chip uses the current VGH driving voltage, the driving chip normally outputs a signal, the backlight is lit, and the panel normally works.

[0012] Otherwise, the driving chip starts the switching VGH voltage mechanism to switch the VGH driving voltage of V1 and V2 to a lower VGHn.

[0013] Further, the method for switching the VGH voltage mechanism is:

[0014] The driving chip first reads the current VGH group name, and makes n = n + 1. The driving chip judges whether n is less than or equal to m. If yes, the VGH driving voltage of V1 and V2 is switched to a lower VGHn. Then, step S4 is repeated.

[0015] Otherwise, the backlight is lit, and the panel outputs an error picture.

[0016] Further, in the step S1, VGHn = K*VGH1,0 < K < 1.

[0017] Further, in the step S1, the difference between adjacent groups of VGH1-VGHn is set according to the type of the display screen.

[0018] The advantage of the present application is that according to the size of the actual working current, the driving voltage of V1 and V2 is adjusted, so that the driving voltage input to the gate stage circuit is the optimal driving voltage, thereby solving the problem that due to device aging, the P point pulls down the Q point too fast, the gate stage driving circuit is turned off in advance, and the stage transmission of the gate stage circuit is affected. Through the above-mentioned manner, the stage transmission failure problem caused by device aging in the gate stage driving circuit can be improved, and the service life of the product is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 is a schematic diagram of the gate stage circuit structure in the prior art;

[0021] Figure 2 is a flowchart of the driving method of the present application;

[0022] Figure 3 is a schematic diagram of the connection between the current detection module of the present application and the gate stage circuit. DETAILED DESCRIPTION

[0023] As Figure 1 is a common gate stage driving circuit schematic diagram. When the Q point pulls High, the signal is output, and the gate stage is opened. When the P point pulls High, the gate stage is closed. The gate stage driving circuit mainly controls the stage transmission mechanism by controlling the level of the P point and the Q point.

[0024] P point is the core of the voltage regulator circuit, generally, when V1 or V2 signal output VGH, P1 point or P2 point pull high, make Gn keep closed state. Generally, VGH voltage is constant. However, after the panel works for a long time, some devices of the voltage regulator circuit may be aged, causing P point to pull down Q point too fast, to close the gate stage drive circuit in advance, affecting the gate stage circuit transmission. At this time, the phenomenon can be improved by reducing the VGH voltage of V1 and V2.

[0025] The overall design idea of the application is as follows, a current detection module is added to the voltage for powering the gate stage circuit, and a plurality of VGH drive voltages of V1 and V2 are set. The VGH drive voltage of V1 is equal to the VGH drive voltage of V2. m groups of VGH drive voltages can be set, named VGH1~VGHn, n≤m; VGHn=K*VGH1, 0<K<1. The driving process is as shown in Figure 2

[0026] Firstly, after the equipment is powered on, the panel drive chip starts. At this time, the backlight is not lit, and the VGH drive voltage of V1 and V2 is set to VGH1.

[0027] Then, the panel outputs a specific current detection picture, the current detection module reads the detection picture current value, and compares it with the set experience working current value range. When the transmission failure occurs, the actual working current value will be less than the set working current value. The current detection module will give the comparison result to the drive chip.

[0028] If the actual working current is within the set working current range, it is determined that the panel is normal, and the drive chip normally outputs the signal and the backlight power supply, and the panel works normally.

[0029] If the actual working current value is less than the set working current value, the drive chip starts to switch the VGH voltage mechanism. The drive chip will first read the current VGH group name, confirm n≤m, and there is still switchable VGH voltage, then switch the VGH drive voltage of V1 and V2 to lower VGHn.

[0030] Then, the current detection step is repeated. If the actual working current is within the set working current range, it is determined that the panel is normal, and the drive chip uses the current VGH to normally output the signal and the backlight power supply, and the panel works normally.

[0031] If the actual working current value is still less than the set working current value, the drive chip starts to switch the VGH voltage mechanism again, until all m VGH drive voltages are tested, and if all cannot be improved, the panel outputs an error picture, and the panel is powered off.

[0032] As shown in Figure 2 ​As shown, the driving method of a novel display screen of the present application comprises the following steps:

[0033] S1, set the VGH driving voltage of m groups of V1 and V2, and sequentially name the m groups of VGH driving voltage as VGH1-VGHn, n≤m; and the voltage of VGH1-VGHn gradually decreases;

[0034] S2, after the driving chip of the panel is started, the VGH driving voltage of V1 and V2 is set as VGH1;

[0035] S3, the panel outputs a current detection picture;

[0036] S4, the current detection module reads the actual working current value of the detection picture, and compares it with the set working current value range; for example, Figure 3 As shown, the current detection module is added to the voltage of the gate stage circuit.

[0037] If the actual working current value is within the set working current value range, the driving chip uses the current VGH driving voltage, the driving chip normally outputs signals, the backlight is lit, and the panel normally works;

[0038] Otherwise, the driving chip starts the VGH voltage switching mechanism, and switches the VGH driving voltage of V1 and V2 to a lower VGHn.

[0039] Specifically, the method for switching the VGH voltage mechanism is:

[0040] The driving chip first reads the current VGH group name, and makes n=n+1, the driving chip judges whether n is less than or equal to m, if yes, the VGH driving voltage of V1 and V2 is switched to a lower VGHn, and then, the step S4 is repeated;

[0041] Otherwise, the backlight is lit, and the panel outputs an error picture.

[0042] Specifically, in the step S1, VGHn=K*VGH1, 0

[0043] Specifically, in the step S1, the difference between adjacent groups of VGH1-VGHn is set according to the type of the display screen.

[0044] The specific implementation process of the present application is as follows:

[0045] After the equipment is powered on, the panel driving chip is started. At this time, the backlight is not lit, and the initial value of the VGH driving voltage of V1 and V2 is set as VGH1.

[0046] The working current value range for normal working of the panel is pre-set in the driving chip of the panel according to experience value. The panel outputs a specific current detection picture, the current detection module reads the current value of the detection picture, and the driving chip compares the actual working current value with the pre-set experience working current value range.

[0047] If the actual working current value is within the pre-set experience working current value range, the driving voltage of VGH1 is used, the driving chip normally outputs signals, the backlight is lightened, and the panel normally works.

[0048] If the actual working current value is not within the pre-set experience working current value range, the driving chip first reads the current VGH1 group name, and makes n=1+1, the driving chip judges whether n is less than or equal to m, if yes, the VGH driving voltage of V1 and V2 is switched to VGH2, and the driving voltage value of VGH2 is less than the driving voltage value of VGH1.

[0049] Subsequently, the current detection module continues to read the current value of the detection picture, if the actual working current value is within the pre-set experience working current value range, the driving voltage of VGH2 is used, if the actual working current value is still not within the pre-set experience working current value range, the driving chip starts the VGH voltage switching mechanism again. After m VGH driving voltage tests, if the actual working current value is still not within the pre-set experience working current value range, the panel outputs an error picture, and the panel is powered off.

[0050] The present application adjusts the driving voltage of V1 and V2 according to the size of the actual working current, so that the driving voltage input to the gate stage circuit is the optimal driving voltage, thereby solving the problem that the P point pulls down the Q point too fast due to device aging, the gate stage driving circuit is closed too early, and the gate stage circuit level transmission is affected. Through the above-mentioned manner, the level transmission failure problem caused by device aging in the gate stage driving circuit can be improved, and the service life of the product is prolonged.

[0051] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described are only illustrative, and are not used to limit the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A method of driving a display panel, characterized by: The method comprises the following steps: S1, setting m groups of VGH driving voltages of V1 and V2, when V1 or V2 outputs VGH, P1 or P2 is pulled high, and Gn is kept in a closed state; The m groups of VGH driving voltages are sequentially named as VGH1-VGHn, n≤m; and the voltages of VGH1-VGHn gradually decrease; S2, after a driving chip of the panel is started, the VGH driving voltages of V1 and V2 are set as VGH1; S3, the panel outputs a current detection picture; S4, a current detection module is added to a voltage for supplying power to a gate stage circuit, the current detection module reads an actual working current value of the detection picture, and compares the actual working current value with a set working current value range; If the actual working current value is in the set working current value range, the driving chip uses the current VGH driving voltage, the driving chip normally outputs a signal, the backlight is brightened, and the panel normally works; Otherwise, the driving chip starts a VGH voltage switching mechanism, and switches the VGH driving voltages of V1 and V2 to a lower VGHn.

2. The method of claim 1, wherein: The method of the VGH voltage switching mechanism is as follows: The driving chip first reads a current VGH group name, and sets n=n+1; the driving chip judges whether n is less than or equal to m; if yes, the VGH driving voltages of V1 and V2 are switched to a lower VGHn; then, step S4 is repeated; Otherwise, the backlight is brightened, and the panel outputs an error picture.

3. The method of claim 1, wherein: In the step S1, VGHn=K*VGH1, 0 4. The method of claim 1, wherein: In the step S1, the difference between adjacent groups of VGH1-VGHn is set according to the type of the display screen.

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